Because, when we're going to talk about viruses infecting, their viruses would be generated within the area around affected by some fluid (i.e hydroxyl group) -OH-... So, with due to the respect to above question, all three of the above option are correct.

Adrian Michael said:
(Feb 7, 2016)

How about (B) is not true?

Kidhafti said:
(May 31, 2016)

@Adrian Michael.

B is the correct answer because hydrogen peroxide and formaldehyde do not kill the virus.